Remove protobuf lite for java.

Since the introduction of nano protobufs for Java in
https://codereview.chromium.org/532303003 (and updated in
https://codereview.chromium.org/549543002), there is no need for the
lite protocol buffers anymore.

This CL removes the checked out files initially introduced when
protobuf lite support for Java was added in
https://chromiumcodereview.appspot.com/11347026 and cleans up the
infrastructure regarding generating protocol buffers.

Since lite is not supported anymore, this also removes the requirement
for setting the 'proto_runtime' variable for targets using
build/protoc_java.gypi.

BUG=377891
TBR=zea@chromium.org

Review URL: https://codereview.chromium.org/556933002

Cr-Commit-Position: refs/heads/master@{#294453}

build/protoc_java.py

@@ -6,8 +6,7 @@
 """Generate java source files from protobuf files.
 
 Usage:
-    protoc_java.py {protoc} {proto_path} {java_out} {proto_runtime} \
-        {stamp_file} {proto_files}
+    protoc_java.py {protoc} {proto_path} {java_out} {stamp_file} {proto_files}
 
 This is a helper file for the genproto_java action in protoc_java.gypi.
 
@@ -16,8 +15,6 @@ It performs the following steps:
 2. Creates source directory.
 3. Generates Java files using protoc.
 4. Creates a new stamp file.
-
-proto_runtime must be one of 'nano' and 'lite'.
 """
 
 import os
@@ -26,12 +23,12 @@ import subprocess
 import sys
 
 def main(argv):
-  if len(argv) < 6:
+  if len(argv) < 5:
     usage()
     return 1
 
-  protoc_path, proto_path, java_out, proto_runtime, stamp_file = argv[1:6]
-  proto_files = argv[6:]
+  protoc_path, proto_path, java_out, stamp_file = argv[1:5]
+  proto_files = argv[5:]
 
   # Delete all old sources.
   if os.path.exists(java_out):
@@ -40,15 +37,10 @@ def main(argv):
   # Create source directory.
   os.makedirs(java_out)
 
-  # Figure out which runtime to use.
-  if proto_runtime == 'nano':
-    out_arg = '--javanano_out=optional_field_style=reftypes,' + \
-        'store_unknown_fields=true:' + java_out
-  elif proto_runtime == 'lite':
-    out_arg = '--java_out=' + java_out
-  else:
-    usage()
-    return 1
+  # Specify arguments to the generator.
+  generator_args = ['optional_field_style=reftypes',
+                    'store_unknown_fields=true']
+  out_arg = '--javanano_out=' + ','.join(generator_args) + ':' + java_out
 
   # Generate Java files using protoc.
   ret = subprocess.call(